A Serious Offering: HP Series E Calculators

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Date: 1979

Series E was the first collection of Hewlett-Packard handheld calculators with a diagnostic error code system which identified errors made by the user in entering data. With both business (HP 37E and HP 38E) and scientific (HP 31E, HP 32E and HP 33E) models available, this new generation of calculators had range.